Anti-ultraviolet electronic paper display module and production method thereof

Abstract

The invention discloses an anti-ultraviolet electronic paper display module and a production method thereof. The anti-ultraviolet electronic paper display module comprises a CG protective cover plate layer, an EPD electronic paper module layer and an OCA optical adhesive layer, the OCA layer is located between the CG protection cover plate layer and the electronic paper display EPD layer; the CG protective cover plate layer comprises a CG protective plate made of a transparent material and a transparent anti-ultraviolet UV coating; and a transparent anti-ultraviolet UV coating covers the upper surface or / and the lower surface of the CG protection plate. The method comprises the following steps: A, preparing a CG protection plate; b, the CG protection plate is coated with UV transparent ink to form a CG protection cover plate layer; c, the EPD module is coated with OCA glue; and D, the CG protection cover plate layer is attached to the EPD module.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of display device manufacturing, and particularly relates to an electronic paper display device and a production method. BACKGROUND

[0002] Electronic paper, also known as electronic ink screen, has excellent characteristics such as ultra-low power consumption, continuous display without power consumption, eye protection, and the same display effect and visual experience as paper. A plurality of black and white mixed electronic particles are contained in the same ink capsule, and under the action of current, a plurality of ink capsules are arranged and combined to form "electronic ink". Under the influence of positive and negative charges, these tiny ink capsules operate like a liquid to form various characters and patterns. Its core features are low power consumption and visual health.

[0003] In the field of electronic paper, a variety of special bonding processes are required in the manufacturing process of the electronic paper module, and the technical difficulty is also high. The core material of the electronic paper online module, the water content of the electronic ink film (FPL), needs to be maintained stable, and the change of the water content will directly affect the display effect of the electronic paper. Therefore, a material is needed to seal the electronic ink film around to prevent water vapor from entering or flowing out of the electronic ink microcapsule.

[0004] OCA in the field of electronic ink screen refers to Optically Clear Adhesive used for bonding the multi-layer structure of the screen, which is a double-sided pressure-sensitive adhesive tape without substrate. Its core function is to ensure the stability and optical performance of the screen structure.

[0005] The electronic ink screen is composed of components such as cover plate (PC / PMMA material), light guide plate, ink screen (EDP / OED), etc. OCA needs to bond these materials into a whole, while adapting to the characteristics of high molecular materials (such as PC / PMMA which is easily affected by heat and humidity).

[0006] Electronic paper is increasingly used for outdoor products such as bus stop signs and billboards, mainly because it saves power and the image remains without power consumption. However, electronic paper is sensitive to wavelengths below 380 nm, and long-term outdoor use of electronic paper will damage it.

[0007] In the prior art, a layer of UV-resistant film is added to the structure of the substrate. The core layer structure is "CG + OCA1 + UV-resistant film + OCA2 + EPD module", which serves to ensure display effect, durability and environmental adaptability.

[0008] CG(Cover Glass, protective cover plate) as the outermost layer of protection, must have high light transmittance (> 90%), scratch and impact resistance, the common material is PMMA (acrylic) or tempered glass. In outdoor scenarios, it needs to resist physical erosion such as rain, dust, etc.

[0009] OCA1(first layer of optical glue) adheres CG to the UV protection film, which needs to meet low haze (<1%), high adhesion (>1000gf / in), and avoid delamination or bubble formation in high temperature and humidity environments.

[0010] The UV protection film blocks ultraviolet rays (wavelength 200-400nm), prevents the EPD module from yellowing and optical performance degradation due to long-term sunlight exposure, and improves the visibility of the screen in strong light.

[0011] OCA2(second layer of optical glue) adheres the UV protection film to the EPD module, which needs to adapt to the flexibility of electronic paper (such as bendability) to avoid display abnormalities caused by bonding stress.

[0012] The EPD module (electronic paper display core) is composed of a TFT backplane, electronic ink capsules, and a driving circuit, with the characteristics of bistable display and low power consumption (zero power consumption for static images), suitable for long-term stable operation outdoors. However, the "CG+OCA1+UV protection film+OCA2+EPD module" has many bonding processes, low yield, and low efficiency.

[0013] Glossary:

[0014] EPD is the abbreviation of "electronic paper display" in English, which means electronic paper master display. The meaning of electronic paper master in this application is electronic paper master display.

[0015] UV is the abbreviation of "Ultraviolet" in English, which means ultraviolet.

[0016] FPL is the abbreviation of "Front Plane Lamination" in English, which means front plane lamination display module.

[0017] CG is the abbreviation of "Cover Glass" in English, which means protective cover plate.

[0018] OCA is the abbreviation of "Optically Clear Adhesive" in English, which means optically clear adhesive. SUMMARY

[0019] The technical problem to be solved by the present application is to avoid the problems of multiple bonding processes, poor yield and low efficiency of the electronic paper display module with an anti-UV film in the prior art, and to provide a process method and module for combining the anti-UV film on the protective cover plate layer, which can reduce the process time, greatly improve the yield of the electronic paper display module, and meet the production demand of more efficient display modules.

[0020] The technical solution of the present application for solving the above technical problem is an anti-ultraviolet electronic paper display module, comprising: a CG protective cover plate layer, an EPD electronic paper module layer, and an OCA optical adhesive layer; the OCA optical adhesive layer is located between the CG protective cover plate layer and the electronic paper display EPD layer; the CG protective cover plate layer comprises a CG protective plate of transparent material and a transparent anti-ultraviolet UV coating layer; the transparent anti-ultraviolet UV coating layer covers the upper surface and / or the lower surface of the CG protective plate.

[0021] The CG protective plate material can be glass or acrylic.

[0022] The CG protective cover plate layer can further comprise a silk screen ink layer, and the silk screen ink layer covers the upper surface and / or the lower surface of the CG protective plate.

[0023] The anti-ultraviolet UV coating layer can absorb ultraviolet light with a wavelength of 380 nm or less.

[0024] The technical solution of the present application for solving the above technical problem can also be a production method of an anti-ultraviolet electronic paper display module, comprising the following steps: step A: CG protective plate preparation; step B: CG protective plate coated with UV transparent ink to form a CG protective cover plate layer; step C: EPD module coated with OCA adhesive; and step D: CG protective cover plate layer bonded with EPD module.

[0025] The CG protective plate can be made of glass.

[0026] Step A can comprise the following steps: step A10: cutting and edge grinding to obtain a CG protective plate; step A20: glass tempering and polishing; and step A40: coating the CG protective plate with UV transparent ink to form a CG protective cover plate layer.

[0027] Before step A40, step A30 can be further included, which is: CG protective plate silk screen ink.

[0028] In step C, the CG protective cover plate layer is covered on the OCA layer.

[0029] In step B, the UV transparent ink is covered on the CG protective plate by an electrostatic spraying process.

[0030] One of the beneficial effects of the technical solutions in the present application is that, compared with the 5-layer structure in the prior art, the structure is greatly simplified, and the method is simplified and the production efficiency is improved due to the simplified structure.

[0031] One of the beneficial effects of the technical solutions in the present application is that the CG protective plate can be made of various materials, and has better compatibility and adaptability.

[0032] One of the beneficial effects of the technical solutions in the present application is that the silk screen ink layer facilitates the display content cooperation of the EPD electronic paper module layer, and forms a more abundant product.

[0033] One of the beneficial effects of the technical solutions in the present application is that the UV-resistant UV coating is arranged on the top CG protective cover plate layer, effectively blocks ultraviolet light, and enhances the ultraviolet resistance of the electronic paper display module.

[0034] One of the beneficial effects of the technical solutions in the present application is that the preparation method is simple, easier to operate, and has higher efficiency.

[0035] One of the beneficial effects of the technical solutions in the present application is that the glass is tempered, and polishing enhances the bonding ability of the CG protective plate, which is conducive to coating UV transparent ink and enhances the firmness of the CG protective cover plate layer.

[0036] One of the beneficial effects of the technical solutions in the present application is that the CG protective plate silk screen ink facilitates different advertising needs and prints different patterns or characters on the protective cover plate.

[0037] One of the beneficial effects of the technical solutions in the present application is that the UV transparent ink is covered by an electrostatic spraying process, making the connection of the film layer more reliable and durable.

[0038] One of the beneficial effects of the technical solutions in the present application is that the OCA optical adhesive layer is located between the CG protective cover plate layer and the electronic paper display EPD layer, facilitating the protection of the OCA optical adhesive layer from ultraviolet rays. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 is a cross-sectional view of an electronic paper display module that prevents ultraviolet light;

[0040] Figure 2 is a cross-sectional view of a CG protective cover plate layer Figure 1 ;

[0041] Figure 3 is a cross-sectional view of a CG protective cover plate layer Figure 2 ;

[0042] Figure 4 is a flowchart of a production method of an electronic paper display module that prevents ultraviolet light Figure 1 ;

[0043] Figure 5Production process of the electronic paper display module with anti-UV function Figure 2 ;

[0044] Figure 6 Sectional view of the CG protective cover layer Figure 3 ;

[0045] Figure 7 Sectional view of the CG protective cover layer Figure 4 ;

[0046] Figure 8 Sectional view of the CG protective cover layer Figure 5 ;

[0047] Figure 9 Sectional view of the CG protective cover layer Figure 6 ;

[0048] Figure 10 Sectional view of the CG protective cover layer Figure 7 ;

[0049] Figure 11 Sectional view of the CG protective cover layer Figure 8 ;

[0050] Figure 12 Sectional view of the electronic paper display module with anti-UV function in the prior art. DETAILED DESCRIPTION

[0051] The embodiments of the present application will be described in further detail below with reference to the drawings.

[0052] It should be noted that the following description of the preferred embodiments of the present application is merely illustrative and does not limit the present application in any way. The description of the preferred embodiments of the present application is merely illustrative of the general principles of the present application. The embodiments described in the present application are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0053] In the description of the present application, it needs to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and the technical features numbered with Arabic numerals 1, 2, 3, and the like, as well as the numbering "A" and "B", are only for the purpose of description, for the convenience of explanation, and do not represent the chronological or spatial sequence; cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second", and the technical features numbered with Arabic numerals 1, 2, 3, etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "several" is two or more, unless otherwise explicitly specified.

[0054] As Figures 1 to 2 An ultraviolet-proof electronic paper display module, comprising: a CG protective cover plate layer, an EPD electronic paper module layer, and an OCA optical adhesive layer; the OCA optical adhesive layer is located between the CG protective cover plate layer and the electronic paper display EPD layer; the CG protective cover plate layer comprises a CG protective plate of transparent material and a transparent ultraviolet-proof UV coating layer; as Figure 2 And Figure 3 The transparent ultraviolet-proof UV coating layer covers the upper surface or / and the lower surface of the CG protective plate. As Figure 2 The transparent ultraviolet-proof UV coating layer covers the lower surface of the CG protective plate. As Figure 3 The transparent ultraviolet-proof UV coating layer covers the upper surface of the CG protective plate.

[0055] The material of the CG protective plate is glass; or the material of the CG protective plate is acrylic.

[0056] As Figures 6 to 7 The CG protective cover plate layer further comprises a silk-screen ink layer; the silk-screen ink layer covers the upper surface or / and the lower surface of the CG protective plate. As Figure 6 The silk-screen ink layer covers the upper surface of the CG protective plate. An ultraviolet-proof UV coating layer is arranged on the silk-screen ink layer. As Figure 7 The silk-screen ink layer covers the lower surface of the CG protective plate, and an ultraviolet-proof UV coating layer is arranged below the silk-screen ink layer. The silk-screen ink layer does not cover completely, but can cover a part. The silk-screen ink layer can print different silk-screen patterns according to customer's customized requirements.

[0057] AsFigures 8 to 9 The CG protective cover plate layer comprises an ultraviolet (UV) protective coating and a silk screen ink layer. Figure 8 The transparent ultraviolet (UV) protective coating covers the lower surface of the CG protective plate, and the silk screen ink layer is arranged below the ultraviolet (UV) protective coating. Figure 9 The transparent ultraviolet (UV) protective coating covers the lower surface of the CG protective plate. The silk screen ink layer is arranged on the upper surface of the CG protective plate.

[0058] The CG protective cover plate layer comprises an ultraviolet (UV) protective coating and a silk screen ink layer. Figures 10 to 11 The transparent ultraviolet (UV) protective coating covers the lower surface of the CG protective plate, and the silk screen ink layer is arranged below the ultraviolet (UV) protective coating. Figure 10 The transparent ultraviolet (UV) protective coating covers the lower surface of the CG protective plate. The silk screen ink layer is arranged on the upper surface of the CG protective plate. Figure 11

[0059] The ultraviolet (UV) protective coating can absorb ultraviolet light with a wavelength of 380 nm or less.

[0060] The CG protective cover plate layer comprises an ultraviolet (UV) protective coating and a silk screen ink layer. Figure 4 The method comprises the following steps: A, CG protective plate preparation; B, CG protective plate coating UV transparent ink to form a CG protective cover plate layer; C, EPD module coating OCA glue; D, CG protective cover plate layer and EPD module are pasted. In step C, the CG protective cover plate layer is covered on the OCA layer. In step B, the UV transparent ink is covered on the CG protective plate by electrostatic spraying process.

[0061] The CG protective cover plate layer comprises an ultraviolet (UV) protective coating and a silk screen ink layer. Figure 5 The method comprises the following steps: A, CG protective plate preparation; B, CG protective plate coating UV transparent ink to form a CG protective cover plate layer; C, EPD module coating OCA glue; D, CG protective cover plate layer and EPD module are pasted. In step C, the CG protective cover plate layer is covered on the OCA layer. In step B, the UV transparent ink is covered on the CG protective plate by electrostatic spraying process.

[0062] The method comprises the following steps: A, CG protective plate preparation; B, CG protective plate coating UV transparent ink to form a CG protective cover plate layer; C, EPD module coating OCA glue; D, CG protective cover plate layer and EPD module are pasted. In step C, the CG protective cover plate layer is covered on the OCA layer. In step B, the UV transparent ink is covered on the CG protective plate by electrostatic spraying process. Figure 5 The method comprises the following steps: A, CG protective plate preparation; B, CG protective plate coating UV transparent ink to form a CG protective cover plate layer; C, EPD module coating OCA glue; D, CG protective cover plate layer and EPD module are pasted. In step C, the CG protective cover plate layer is covered on the OCA layer. In step B, the UV transparent ink is covered on the CG protective plate by electrostatic spraying process.

[0063] The method comprises the following steps: A, CG protective plate preparation; B, CG protective plate coating UV transparent ink to form a CG protective cover plate layer; C, EPD module coating OCA glue; D, CG protective cover plate layer and EPD module are pasted. In step C, the CG protective cover plate layer is covered on the OCA layer. In step B, the UV transparent ink is covered on the CG protective plate by electrostatic spraying process. Figures 6 to 11 The method comprises the following steps: A, CG protective plate preparation; B, CG protective plate coating UV transparent ink to form a CG protective cover plate layer; C, EPD module coating OCA glue; D, CG protective cover plate layer and EPD module are pasted. In step C, the CG protective cover plate layer is covered on the OCA layer. In step B, the UV transparent ink is covered on the CG protective plate by electrostatic spraying process. The method comprises the following steps: A, CG protective plate preparation; B, CG protective plate coating UV transparent ink to form a CG protective cover plate layer; C, EPD module coating OCA glue; D, CG protective cover plate layer and EPD module are pasted. In step C, the CG protective cover plate layer is covered on the OCA layer. In step B, the UV transparent ink is covered on the CG protective plate by electrostatic spraying process.

[0064] The technical solution in this application is to add a coating on the glass to improve product yield and efficiency. This coating has a certain UV blocking function. At the same time, the coating needs to be transparent and have very good adhesion. The changed structure is CG+OCA+EPD.

[0065] UV light blocking mainly blocks the wavelength below 380nm. Short wavelength has strong penetrating power and is more harmful to electronic paper. Therefore, it mainly blocks the short wavelength in sunlight. The coating on the glass is added with UV blocking agent. This solvent absorbs the short wavelength in sunlight, thus playing the role of blocking UV. Figure 12 The 5-layer structure shown is simplified to a 3-layer structure, which greatly simplifies the operation and improves the production efficiency.

[0066] In one embodiment of the present application, a large sheet of glass is cut and edge-ground. The ground glass is then tempered and polished. The treated glass is cleaned, screen-printed with ink, and then dried. The screen-printed product is then screen-printed with a transparent UV-blocking ink and baked. After the coating is applied, the UV-blocking properties and ink adhesion are tested.

[0067] As shown in the accompanying drawings, the above description is only an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the invention description and the accompanying drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An anti-ultraviolet electronic paper display module, characterized in that: include: CG protective cover layer, EPD electronic paper module layer, OCA optical adhesive layer; The OCA optical adhesive layer is located between the CG protective cover layer and the electronic paper display EPD layer; The CG protective cover layer includes a CG protective plate made of a transparent material and a transparent anti-ultraviolet UV coating; the transparent anti-ultraviolet UV coating covers the upper surface and / or the lower surface of the CG protective plate.

2. The UV-proof electronic paper display module according to claim 1, characterized in that: The CG protection plate is made of glass; Or the CG protection plate is made of acrylic.

3. The UV-proof electronic paper display module according to claim 1, wherein: The CG protective cover layer further includes a silk screen ink layer; the silk screen ink layer is located on the upper surface and / or lower surface of the CG protective plate.

4. The UV-proof electronic paper display module according to claim 1, wherein: The anti-ultraviolet UV coating can absorb ultraviolet rays with a wavelength below 380nm.

5. A method for producing an ultraviolet-proof electronic paper display module, characterized in that: The method comprises the steps A: preparing a CG protection plate; Step B: coating the CG protection plate with UV transparent ink to form a CG protection cover layer; Step C: Apply OCA glue to the EPD module; Step D: Laminating the CG protective cover layer to the EPD module.

6. The method for producing an ultraviolet-proof electronic paper display module according to claim 5, wherein: The CG protection plate is made of glass.

7. The method for producing an ultraviolet-proof electronic paper display module according to claim 6, wherein: Step A includes Step A10: Cut the glass, grind the edges, and obtain the CG protection plate; Step A20: Glass tempering and polishing; Step A40: coating UV transparent ink on the CG protection plate to form a CG protection cover plate layer.

8. The method for producing an ultraviolet-proof electronic paper display module according to claim 7, wherein: Before step A40, the method further includes step A30; Step A30: Screen printing ink on CG protection board.

9. The method for producing an ultraviolet-proof electronic paper display module according to claim 5, wherein: In step C, the CG protective cover layer is covered on the OCA layer.

10. The method for producing an ultraviolet-proof electronic paper display module according to claim 5, wherein: In step B, the UV transparent ink is coated on the CG protection plate through an electrostatic spraying process.

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